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#!/usr/bin/env ruby
# Copyright 2015, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# Sample gRPC Ruby server that implements the Math::Calc service and helps
# validate GRPC::RpcServer as GRPC implementation using proto2 serialization.
#
# Usage: $ path/to/math_server.rb
this_dir = File.expand_path(File.dirname(__FILE__))
lib_dir = File.join(File.dirname(this_dir), 'lib')
$LOAD_PATH.unshift(lib_dir) unless $LOAD_PATH.include?(lib_dir)
$LOAD_PATH.unshift(this_dir) unless $LOAD_PATH.include?(this_dir)
require 'forwardable'
require 'grpc'
require 'math_services'
require 'optparse'
# Holds state for a fibonacci series
class Fibber
def initialize(limit)
fail "bad limit: got #{limit}, want limit > 0" if limit < 1
@limit = limit
end
def generator
return enum_for(:generator) unless block_given?
idx, current, previous = 0, 1, 1
until idx == @limit
if idx.zero? || idx == 1
yield Math::Num.new(num: 1)
idx += 1
next
end
tmp = current
current = previous + current
previous = tmp
yield Math::Num.new(num: current)
idx += 1
end
end
end
# A EnumeratorQueue wraps a Queue to yield the items added to it.
class EnumeratorQueue
extend Forwardable
def_delegators :@q, :push
def initialize(sentinel)
@q = Queue.new
@sentinel = sentinel
end
def each_item
return enum_for(:each_item) unless block_given?
loop do
r = @q.pop
break if r.equal?(@sentinel)
fail r if r.is_a? Exception
yield r
end
end
end
# The Math::Math:: module occurs because the service has the same name as its
# package. That practice should be avoided by defining real services.
class Calculator < Math::Math::Service
def div(div_args, _call)
if div_args.divisor.zero?
# To send non-OK status handlers raise a StatusError with the code and
# and detail they want sent as a Status.
fail GRPC::StatusError.new(GRPC::Status::INVALID_ARGUMENT,
'divisor cannot be 0')
end
Math::DivReply.new(quotient: div_args.dividend / div_args.divisor,
remainder: div_args.dividend % div_args.divisor)
end
def sum(call)
# the requests are accesible as the Enumerator call#each_request
nums = call.each_remote_read.collect(&:num)
sum = nums.inject { |s, x| s + x }
Math::Num.new(num: sum)
end
def fib(fib_args, _call)
if fib_args.limit < 1
fail StatusError.new(Status::INVALID_ARGUMENT, 'limit must be >= 0')
end
# return an Enumerator of Nums
Fibber.new(fib_args.limit).generator
# just return the generator, GRPC::GenericServer sends each actual response
end
def div_many(requests)
# requests is an lazy Enumerator of the requests sent by the client.
q = EnumeratorQueue.new(self)
t = Thread.new do
begin
requests.each do |req|
GRPC.logger.info("read #{req.inspect}")
resp = Math::DivReply.new(quotient: req.dividend / req.divisor,
remainder: req.dividend % req.divisor)
q.push(resp)
Thread.pass # let the internal Bidi threads run
end
GRPC.logger.info('finished reads')
q.push(self)
rescue StandardError => e
q.push(e) # share the exception with the enumerator
raise e
end
end
t.priority = -2 # hint that the div_many thread should not be favoured
q.each_item
end
end
def load_test_certs
this_dir = File.expand_path(File.dirname(__FILE__))
data_dir = File.join(File.dirname(this_dir), 'spec/testdata')
files = ['ca.pem', 'server1.key', 'server1.pem']
files.map { |f| File.open(File.join(data_dir, f)).read }
end
def test_server_creds
certs = load_test_certs
GRPC::Core::ServerCredentials.new(nil, certs[1], certs[2])
end
def main
options = {
'host' => 'localhost:7071',
'secure' => false
}
OptionParser.new do |opts|
opts.banner = 'Usage: [--host <hostname>:<port>] [--secure|-s]'
opts.on('--host HOST', '<hostname>:<port>') do |v|
options['host'] = v
end
opts.on('-s', '--secure', 'access using test creds') do |v|
options['secure'] = v
end
end.parse!
s = GRPC::RpcServer.new
if options['secure']
s.add_http2_port(options['host'], test_server_creds)
GRPC.logger.info("... running securely on #{options['host']}")
else
s.add_http2_port(options['host'])
GRPC.logger.info("... running insecurely on #{options['host']}")
end
s.handle(Calculator)
s.run_till_terminated
end
main
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